Exercise platform for rehabilitation management

ABSTRACT

Proposed is an exercise platform for rehabilitation management and, more particularly, an exercise platform for rehabilitation management that estimates maximal oxygen uptake (VO2max) through a sensor being able to acquire condition data of a user and that adjusts exercise intensity of the user in accordance with the estimated maximal oxygen uptake (VO2max).

CROSS REFERENCE TO RELATED APPLICATION

The present application claims priority to Korean Patent Application No.10-2021-0174050, Dec. 7, 2021, the entire contents of which isincorporated herein for all purposes by this reference.

BACKGROUND OF THE INVENTION Field of the Invention

The present disclosure relates to an exercise platform forrehabilitation management and, more particularly, to an exerciseplatform for rehabilitation management that estimates maximal oxygenuptake (VO2max) through a sensor being able to acquire condition data ofa user and that adjusts exercise intensity of the user in accordancewith the estimated maximal oxygen uptake (VO2max).

Description of the Related Art

Cardiac diseases are diseases that continue for a long period of timeand have a high possibility of not improving. Even though patientsundergo various surgical procedures or surgeries such as percutaneoustransluminal coronary angioplasty to treat these diseases, they alsohave to undergo cardiovascular rehabilitation or cardiac rehabilitationfor a considerably long period of time because the surgical proceduresor surgeries do not recover the heart function into the normal statewithin a short period of time.

That is, cardiovascular/cardiac rehabilitation is a process ofrecovering, increasing, and maintaining the physical, metal,socioeconomic, and job-related levels of patients with cardiac diseasesup to appropriate levels and is individually applied to fit to thecharacteristics of individuals through programs that suppress andprevent progress of cardiac diseases.

Such a cardiovascular/cardiac rehabilitation program is usually dividedinto four stages, that is, an acute stage in which a patient is in thehospital after myocardial infarction occurred, a recovery stage that isthe period of 4˜6 weeks accompanied with scars at the myocardialinfarction part after the attack, a training stage in which cardiacrehabilitation is actually performed through exercise, and a maintainingstage for maintaining the effect of the training stage after guidelinesfor exercise or work are made through an exercise stress test at the endof the training stage.

However, since all cardiac rehabilitation training is performed atpresent in the hospital under prescriptions of doctors, the patients'intention of performing rehabilitation training is actually not high, sothe need for online medical treatment/medical examination/patientmonitoring services for such cardiac rehabilitation training isincreasing.

PRIOR ART DOCUMENT

-   (Patent Document 1) Korean Patent No. 10-1355506 (published    on 2014. 02. 06)-   (Patent Document 2) Korean Patent No. 10-1301305 (published    on 2013. 09. 10)-   (Patent Document 3) Korean Patent Application Publication No.    10-2016-0139960 (published on 2016. 12. 07)

SUMMARY OF THE INVENTION

The present disclosure has been made in an effort to solve the generalproblems described above and an objective of the present disclosure isto provide an exercise platform for managing rehabilitation patients,that is, an exercise platform that determines and feeds backprescriptions, which are formulated, quantified, and improved to besuitable for users on the basis of maximal oxygen uptake (VO2max), inreal time to the users.

Another objective of the present disclosure is to provide an exerciseplatform for rehabilitation management that estimates maximal oxygenuptake using various data that are obtained through a user sensor unit,which is configured in various wearable types such as a band, a watch,and a helmet to be able to be easily applied even to cardiacrehabilitation patients who have difficulty in using devices formeasuring maximal oxygen uptake.

In order to achieve the objectives described above, an exercise platformfor rehabilitation management of the present disclosure includes: anexercise apparatus including a drum, pedals connected to the drum andhaving a wireless pedaling sensor therein, a seat disposed on the drum,and handles connected to a side of the drum; a controller disposed onthe handles and configured to operate characters of contents thatoperate in cooperation with the exercise apparatus; a communication unitconnected to the exercise apparatus in a wireless or wired type; aserver connected to the communication unit and configured to receivedata of the exercise apparatus and generate an exercise apparatuscontrol signal; a processor installed in the exercise apparatus andconfigured to acquire a sensor value from the wireless pedaling sensor,select a character from a rehabilitation content, and control theselected character on the basis of the sensor value acquired from thewireless pedaling sensor; a display disposed between the handles andconfigured to display an image of the rehabilitation content incooperation with the processor; and a mobile device configured toreceive an image displayed on the display and data of the exerciseapparatus in cooperation with the display and the exercise apparatus.

The exercise platform further includes a heartbeat measurer disposed onthe handles and configured to measure heartbeat of a user.

The exercise platform may further include a user sensor unit being ableto acquire condition data of a user.

The server may include a VO2max estimator configured to estimate VO2maxusing heartbeat data of a user, which are measured by the heartbeatmeasurer, and condition data of the user, which are acquired from theuser sensor unit when the platform further includes the user sensorunit, in cooperation with the heartbeat measurer.

The server may further include an exercise intensity proposer configuredto propose exercise intensity to a user.

An exercise intensity adjuster configured to adjust intensity ofexercise by adjusting rotation intensity of the pedals may be includedin the drum of the exercise apparatus.

The display may include a control unit configured to change colors thatare shown on the display to show exercise intensity of a user.

The processor may estimate torque according to the number of revolutionsof the pedals using load values in stages, which are measured by anexercise intensity measurer, and linear regression analysis.

The exercise intensity proposer may measure a heart rate of a userbefore exercising using the heartbeat measurer, estimate VO2max from theheart rate before exercising, determines a physical grade on the basisof the estimated VO2max, measure a heart rate of the user duringexercising, determine whether the measured heart rate during exercisingis out of a reference heart rate range of the determined physical grade,and inform the user that the heart rate during exercising is out of thereference heart rate range, if so, through the display or generating analarm sound, thereby proposing exercise intensity to the user.

According to the exercise platform for rehabilitation management of thepresent disclosure, maximal oxygen uptake that is an index that makes itpossible to accurately find out a real-time health condition of a useris estimated and exercise intensity of the user is adjusted inaccordance with the estimated maximal oxygen uptake, whereby there is aneffect that rehabilitation is effectively achieved.

Further, maximal oxygen uptake is estimated using a sensor, the exerciseplatform can be easily applied even to cardiac rehabilitation patientswho have difficulty in using devices.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objectives, features and other advantages of thepresent invention will be more clearly understood from the followingdetailed description when taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a diagram showing the configuration of an exercise platformfor rehabilitation management of the present disclosure;

FIG. 2 is a diagram showing the configuration of an exercise apparatus;

FIG. 3 is a diagram showing the configuration of a server of the presentdisclosure; and

FIG. 4 is a flowchart showing an embodiment of a determiner of thepresent disclosure.

DETAILED DESCRIPTION OF THE INVENTION

The features and advantages of the present disclosure described abovewill be clearer through the following detailed description relating tothe accompanying drawing, so the spirit of the present disclosure wouldbe easily implemented by those skilled in the art. The presentdisclosure may be modified in various ways and implemented by variousexemplary embodiments, so that specific exemplary embodiments are shownin the drawings and will be described in detail herein. However, it isto be understood that the present invention is not limited to thespecific exemplary embodiments, but includes all modifications,equivalents, and substitutions included in the spirit and the scope ofthe present disclosure. Terms used in the present specification are usedonly in order to describe specific exemplary embodiments rather thanlimiting the present disclosure.

Hereinafter, exemplary embodiments of the present disclosure aredescribed in detail with reference to the accompanying drawings.

FIG. 1 is a diagram showing the configuration of an exercise platformfor rehabilitation management of the present disclosure, FIG. 2 is adiagram showing the configuration of an exercise apparatus, and FIG. 3is a diagram showing the configuration of a server of the presentdisclosure.

As shown in FIGS. 1 to 3 , an exercise platform for rehabilitationmanagement (hereafter, referred to as an exercise platform) of thepresent disclosure includes an exercise apparatus 100, a controller 200,a communication unit 300, a server 400, a processor 500, a display 600,a mobile device 700, and a user sensor unit 800 that can acquirecondition data of a user.

As shown in FIG. 2 , the exercise apparatus 100 includes a drum 110,pedals 120 connected to the drum and having a wireless pedaling sensortherein, a seat 130 disposed on the drum, and handles 140 connected to aside of the drum.

The drum 110 may further include an exercise intensity adjuster thatoperates in cooperation with the processor and the display throughwired/wireless communication, adjusts pedal rotation intensity, whichwill be described below, using the magnetism of a magnet, and displaysthe rotation intensity.

The pedals 120 are components having a wired pedaling sensor therein.

The pedals are disposed at the left and right sides of the exerciseapparatus, respectively, and a sensor value obtained from a depressionforce by the wired pedaling sensor in accordance with movement of thepedals is input to the processor through wired/wireless communication.

The seat 130 is a component for a user to sit and stably perform homecycling thereon and the height thereof can be easily adjusted to fit tothe body shape of a user through an overlap type of frame.

The handles 140 are components for a user to hold the handles and stablyperform home cycling in a stable posture by applying a depression forceand the height thereof can be easily adjusted to fit to the body shapeof a user through an overlap type of frame.

The exercise apparatus 100 may further include a heartbeat measurerdisposed on a side of the handles and measuring the heartbeat of a user.

Since the heartbeat measurer 150 is disposed on a side of the handles,when a user holds the handles to enjoy game contents, the user naturallyholds the heartbeat measurer.

That is, when a user depresses the pedals, the heart rate of the user isnaturally measured through a heart rate monitoring sensor being incontact with a palm of the user holding the handles.

The heartbeat measurer may operate in cooperation with the processor andthe display through wired/wireless communication, so the heart rate of auser obtained by the heartbeat measurer can be displayed in real time onthe display, the processor can propose difficulty of a game content thatis suitable for the heart rate of the user on the basis of the heartrate obtained by the heartbeat measurer, and the user can select theproposed difficulty of the game content that is suitable for the heartrate and perform home cycling.

The heart rate monitoring sensor may be at least one of an opticalsensor, an electrocardiogram (ECG) sensor, and a photoplethysmography(PPG) sensor.

When the heart rate monitoring sensor is an optical sensor, the heartrate monitoring sensor may be composed of a light emitter and a lightreceiver.

The light emitter may be at least any one of an IR (infrared) LED, a RedLED, a Green LED, and a Blue LED and the light receiver may be aphotodiode. When a user holds the heartbeat measurer with a palmthereon, the light emitter of the heart rate monitoring sensor can emitlight to the user's palm and the light receiver can detect the lightreflected back to the user's palm after emitted from the light emitter.

For example, the light may travel deeper than the skin of a user (forexample, to a blood vessel) and then reflect out to determine variationin blood stream of the user. The heart rate monitoring sensor cangenerate a signal by digitizing and sequentially arranging the amountsof light detected by the light receiver. The heart rate monitoringsensor can transmit the generated signal to the processor or thedisplay.

A PPG sensor may use the principle that the degrees of absorption andreflection of light depend on variation of the thickness of a bloodvessel that depends on heartbeat.

When the heart rate monitoring sensor is a PPG sensor, the heart ratemonitoring sensor may be composed of a light emitter that emits infraredlight and a light receiver that senses light that is reflected afteremitted to a user's palm from the light emitter. The heart ratemonitoring sensor can detect a Photoplethysmography (PPG) signal fromvariation a blood flow rate over time that is detected by the lightreceiver.

The processor 500 can be controlled to adjust the rotation intensity ofthe exercise intensity adjuster, that is, to automatically adjust themagnitude of the magnetism of the magnet, thereby being able toautomatically adjust the rotation intensity of the pedals.

That is, the heart rate monitoring sensor can intuitionally show aheartbeat condition to a user by measuring a heart rate by scanning afrequency corresponding to the heartbeat from a generated signal.

The drum of the exercise apparatus may include the exercise intensityadjuster that adjusts the intensity of exercise by adjusting therotation intensity of the pedal. The exercise intensity adjuster 160 canbe controlled to manually or automatically adjust the rotation intensityof the pedals connected with a wheel disposed in the drum, that is, themagnetism of the magnet, thereby being able to adjust the exerciseintensity (power, Watt) for each load (e.g., a load in each of 1 to 10stages) of the pedals.

The exercise intensity adjuster may further include an exerciseintensity measurer that measures variation of exercise intensity.

The exercise intensity measurer 170 operates in cooperation with theprocessor and can, in real time, measure exercise intensity by exerciseintensity adjustment and display the exercise intensity through thedisplay or the mobile device.

The controller 200 is disposed on the handles and is configured tooperate characters of contents that operate in cooperation with theexercise apparatus.

The controller is a component that is disposed on the handles andoperates characters in cooperation with the processor.

The controller includes a joystick disposed on a first handle to controlthe direction of characters and an operation button disposed on a secondhandle to operate motions of characters.

The joystick can employ any one of an analog type or a digital type andit is possible to control the movement direction of characters throughthe joystick.

Meanwhile, the communication unit 300 is connected to the exerciseapparatus in a wireless or wired type.

The communication unit may include one or more communication modulesthat can use a wireless communication network and may include a wirelesscommunication or near field communication module or a positioninformation module.

For example, the wireless communication module is a module for wirelessinternet connection and a wireless internet module may be installedinside or outside the exercise apparatus.

The wireless communication may include cellular communication using atleast one of LTE, LTE-A (LTE Advance), Code Division Multiple Access(CDMA), Wideband CDMA (WCDMA), Universal Mobile TelecommunicationsSystem (UMTS), Wireless Broadband (WiBro), or Global System for MobileCommunications (GSM).

Further, the wireless communication may include at least one of WirelessFidelity (WiFi), Bluetooth, Bluetooth Low Energy (BLE), Zigbee, NearField Communication (NFC), magnetic secure transmission, Radio Frequency(RF), or Body Area Network (BAN).

Further, the wireless communication may include GNSS. GNSS, for example,may be a global positioning system (GPS), a global navigation satellitesystem (Glonass), a Beidou navigation satellite system (hereafter,referred to as “Beidou”), or a Galileo, the European globalsatellite-based navigation system.

The wire communication, for example, may include at least one of aUniversal Serial Bus (USB), a High Definition Multimedia Interface(HDMI), an RS-232 (Recommended Standard-232), power line communication,or a Plain Old Telephone Service (POTS).

Encoding that is suitable for wired/wireless communication can be usedto secure data communication when data are transmitted to the display orthe mobile device from the processor through the communication unit in awired/wireless type or data acquired by the heartbeat measurer, theexercise intensity adjuster, and the exercise intensity measurer aretransmitted to the display or the mobile device through thecommunication unit in a wired/wireless type,

Meanwhile, the server 400 is connected to the communication unit,receives data from the exercise apparatus, and generates an exercisecontrol signal.

The server may further include a VO2max estimator that estimates VO2maxusing heartbeat data of a user, which are measured by the heartbeatmeasurer, and condition data of the user, which are acquired from a usersensor unit when the platform further includes the user sensor unit, incooperation with the heartbeat measurer.

The VO2max estimator 410 detects estimated VO2max by measuring the time(T) that it takes to reach 85% of a maximum heart rate (HR max) from aheart rate (HR Rest) in a rest state.

In order to measure the heart rate in a rest state, the heart rate forthe first 1 minute in a rest state with a user wearing a user terminalis measured.

After the rest state, the heart rate when the user exercises using Balkeprotocol is measured, and then when the heart rate reaches 85% of thevalue obtained by subtracting the age of the user from the maximum heartrate, the user stops exercising and the elapsed time (T) is measured.

On the basis of the elapsed time (T) measured through thisconfiguration, the VO2max estimator 410 can acquire the elapsed time (T:min) and estimate VO2max through the following Equation 1 based on sex.

When the platform further includes the user sensor unit, it is possibleto calculate a correction coefficient α on the basis of the conditiondata of a user acquired through the user sensor unit 800 and use thecorrection coefficient α to estimate VO2max. In more detail, whencalculating the correction coefficient α, it is possible to define acorrection coefficient α as a value larger than 0 and smaller than 1 byacquiring cardiac sound of a user as a condition datum through the usersensor unit 800, additionally analyzing the condition datum, andapplying whether the cardiac sound repeats in a cycle larger than orsmaller than a specific reference. When the user sensor unit is notincluded, it is possible to define the correction coefficient α as 1.

VO2 max of male=2.94×T×α+8.33  [Equation 1]

VO2max of female=2.74×T×α+8.05

In general, mask type measurement devices were used to measure VO2max,but when such measurement devices are applied to rehabilitationpatients, the measurement devices interfered with breathing of therehabilitation patients, so not only it was difficult to apply themeasurement devices to rehabilitation patients, but it was difficult toeasily use the measurement devices because most of the measurementdevices are expensive.

Accordingly, in an embodiment of the present disclosure, it is possibleto measure a heart rate and time through the VO2max and estimate VO2maxusing measured values, whereby it is possible to easily estimate VO2maxof rehabilitation patients.

The server may further include an exercise intensity proposer thatproposes exercise intensity to a user.

The exercise intensity proposer 420 measures the heart rate of a userbefore exercising using the heartbeat measurer, estimates VO2max fromthe heart rate before exercising, determines a physical grade on thebasis of the estimated VO2max, measures the heart rate of the userduring exercising, determines whether the measured heart rate duringexercising is out of a reference heart rate range of the determinedphysical grade, and, when the heart rate during exercising is out of thereference heart rate range, informs the user of the fact through adisplay or by generating an alarm sound, thereby being able to proposeexercise intensity to the user.

The exercise intensity proposer measures the heart rate of a user beforeexercising using the heartbeat measurer, estimates VO2max from the heartrate before exercising, determines a physical grade on the basis of theestimated VO2max, measures the heart rate of the user during exercising,determines whether the measured heart rate during exercising is out of areference heart rate range of the determined physical grade, and whenthe heart rate during exercising is out of the reference heart raterange, informs the user of the fact through a display or by generatingan alarm sound, thereby proposing exercise intensity to the user.

The determining step of the exercise intensity proposer includes thefollowing detailed steps.

As shown in FIG. 4 , in the determining step, when a heart rate measuredin a second heartbeat measurement step is not out of a heart rate rangeof a user, an exercise progress step that allows for exercise of theuser can be entered.

In the determining step, when the heart rate measured in a secondheartbeat measurement step is out of a heart rate range of a user, aninforming step of informing the user of the fact through the display orthe mobile device can be performed.

Even after the alarming step, when the exercise progresses at the samespeed as that before the alarming step or the heart rate does not enteran appropriate heart rate range of the user, an ending step that stopsthe exercise of the user is entered.

A rehabilitation patient is enabled to exercise with appropriateintensity through the configuration described above, whereby it ispossible to increase efficiency of exercise and prevent a safetyaccident, etc. due to excessive exercise.

Meanwhile, the processor 500 is installed in the exercise apparatus,acquires a sensor value from the wireless pedaling sensor, selects acharacter from a rehabilitation content, and operates the selectedcharacter on the basis of the sensor value acquired from the wirelesspedaling sensor.

The processor is a component that is installed in the exerciseapparatus, acquires a sensor value from the wireless pedaling sensor,selects a character from a game content, and operates the selectedcharacter on the basis of the sensor value acquired from the wirelesspedaling sensor.

The processor may include one or more of a Central Processing Unit(CPU), an Application Processor (AP), or a Communication Processor (CP).

The processor can estimate torque according to the number of revolutionsof the pedals using load values in the stages, which are measured by theexercise intensity measurer, and linear regression analysis.

The method of estimating torque according to the number of revolutionsof the pedals described above can measure reference torque through apower meter, which is separately provided, calculate a fitting functionfor inputting the number of revolutions through linear regressionanalysis, and then estimate torque corresponding to exercise intensity(the stages of pedaling) set by a user.

Accordingly, it is possible to estimate the physical ability of a userby estimating torque corresponding to exercise intensity (the stages ofpedaling) even though the user does not purchase an expensive powermeter, and simultaneously display the physical ability of the userthrough the display. Further, the processor recommends game contentssuitable for the physical ability of the user, whereby the user canselect game contents in accordance with his/her physical ability.

The processor can perform calculating or data processing in connectionwith control and communication of at least one other component of theexercise apparatus.

Meanwhile, the display 6000 is disposed between handles and displaysimages of the rehabilitation contents in cooperation with the processor.

The display is a component disposed between the handles, that is,between the first handle and the second handle and displaying images ofgame contents in cooperation with the processor.

The display may display images (texts, images, videos, icons, symbols,etc.) of game contents in cooperation with the processor, or may operatewith the processor through wired/wireless communication and displayimages of game contents through a mobile device of a user.

The display may include a Liquid Crystal Display (LCD), a Light EmittingDiode (LED) display, an Organic Light Emitting Diode (OLED) display, ora Micro Electronic Mechanical System (MEMS) display, or an electronicpaper display.

The display may include a touch screen and, for example, can receivetouching, gesturing, approaching, or hovering input by an electronic penor a part of the body of a user.

The display may include a control unit that changes colors that areshown on the display to exercise intensity of a user.

The control unit 610 changes colors that are shown on the display inaccordance with the current exercise intensity.

There may be a plurality of exercise programs classified into aplurality of exercise intensity ranges to have different items ofexercise intensity, and a plurality of different colors corresponding tothe plurality of exercise programs, respectively, may be set in advance.

In this case, the control unit can determine an exercise programincluding current exercise intensity of a user of the plurality ofexercise programs and can control the display to show a colorcorresponding to the determined exercise program.

For example, when current exercise intensity of a user is in the rangeof 20˜30%, “white” that is the color showing that the user is exercisingin an “elementary mode” having the lowest exercise intensity can beshown.

When current exercise intensity of a user is in the range of 30˜40%,“green” that is the color showing that the user is exercising in a“middle mode” can be shown, and when current exercise intensity of auser is in the range of “40˜60%, “blue” that is the color showing thatthe user is exercising in an “advanced mode” can be shown.

Further, when current exercise intensity of a user is in the range of60˜80%, “red” that is the color showing that the user is exercising in a“highest mode” having the highest exercise intensity can be shown.

As described above, a color corresponding to current exercise intensityof a user is shown through the display, the user can easily visuallycheck the current exercise intensity.

The mobile device 700 receives an image displayed on the display anddata of the exercise apparatus in cooperation with the display and theexercise apparatus, and the user sensor unit 800 is configured to beable to acquire condition data of a user.

In more detail, the user sensor unit 800 may be implemented in varioustypes, that is, as an embodiment, may be implemented in various types ofwearable device such as a band, a watch, a helmet, a belt, etc., and asanother embodiment, may be implemented a type of patch that is attachedto the skin. As for the condition data of a user, not only a heartbeat,but very various data such as heart sound and body temperature may beadditionally acquired.

The configuration and operation of a high-frequency wirelesscommunication system according to the present disclosure was describedabove and exemplary embodiments of the present disclosure were describedabove, but it should be understood that the present disclosure may bechanged and modified in various ways by those skilled in the art withoutdeparting from the spirit and scope of the present disclosure describedin the following claims.

What is claimed is:
 1. An exercise platform for rehabilitationmanagement, the exercise platform comprising: an exercise apparatusincluding a drum, pedals connected to the drum and having a wirelesspedaling sensor therein, a seat disposed on the drum, and handlesconnected to a side of the drum and having a heartbeat measurerconfigured to measure heartbeat of a user; a controller disposed on thehandles and configured to operate characters of contents that operate incooperation with the exercise apparatus; a communication unit connectedto the exercise apparatus in a wireless or wired type; a serverconnected to the communication unit and configured to receive data ofthe exercise apparatus and generate an exercise apparatus controlsignal; a processor installed in the exercise apparatus and configuredto acquire a sensor value from the wireless pedaling sensor, select acharacter from a rehabilitation content, and control the selectedcharacter on the basis of the sensor value acquired from the wirelesspedaling sensor; a display disposed between the handles and configuredto display a video of the rehabilitation content in cooperation with theprocessor; a mobile device configured to receive an image displayed onthe display and data of the exercise apparatus in cooperation with thedisplay and the exercise apparatus; and a user sensor unit configured toacquire condition data of a user and calculates a correction coefficientfrom the condition data of a user, wherein the server includes a VO2maxestimator configured to estimate VO2max using heartbeat data of a user,which are measured by the heartbeat measurer, and condition data of theuser, which are acquired from the user sensor unit when the platformfurther includes the user sensor unit, in cooperation with the heartbeatmeasurer, and the VO2max estimator of the server acquires elapsed timeand estimates VO2max using the following equations,VO2 max of male=2.94×T×α+8.33VO2 max of female=2.74×T×α+8.05 Wherein T is time that it takes to reach85% of a maximum heart rate from a heart rate in a rest state and a is acorrection coefficient.
 2. The exercise platform of claim 1, wherein theserver further includes an exercise intensity proposer configured topropose exercise intensity to a user.
 3. The exercise platform of claim1, wherein an exercise intensity adjuster configured to adjust intensityof exercise by adjusting rotation intensity of the pedals is included inthe drum of the exercise apparatus.
 4. The exercise platform of claim 1,wherein the display includes a control unit configured to change colorsthat are shown on the display to show exercise intensity of a user. 5.The exercise platform of claim 1, wherein the processor estimates torqueaccording to the number of revolutions of the pedals using load valuesin stages, which are measured by an exercise intensity measurer, andlinear regression analysis.
 6. The exercise platform of claim 2, whereinthe exercise intensity proposer measures a heart rate of a user beforeexercising using the heartbeat measurer, estimates VO2max from the heartrate before exercising, determines a physical grade on the basis of theestimated VO2max, measures a heart rate of the user during exercising,determines whether the measured heart rate during exercising is out of areference heart rate range of the determined physical grade, and, whenthe heart rate during exercising is out of the reference heart raterange, informs the user of the fact through a display or by generatingan alarm sound, thereby proposing exercise intensity to the user.